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cestrela7 [59]
4 years ago
12

Complete the identity. cos (alpha - beta)/cos alpha cos beta=?

Mathematics
2 answers:
Gnoma [55]4 years ago
6 0
When you see a formula like this, try to operate, so you will see some identities sooner or later. In this case, we have a substraction identity:

\frac{cos ( \alpha  -  \beta )}{cos  \alpha cos  \beta } = \frac{cos   \alpha cos  \beta + sin \alpha sin  \beta }{cos  \alpha cos  \beta } = 1 + tan α · tan β
MatroZZZ [7]4 years ago
5 0

Answer:

When you see a formula like this, try to operate, so you will see some identities sooner or later. In this case, we have a substraction identity:

\frac{cos ( \alpha  -  \beta )}{cos  \alpha cos  \beta }  =  \frac{cos   \alpha cos  \beta + sin \alpha sin  \beta }{cos  \alpha cos  \beta }  = 1 + tan α · tan β

Step-by-step explanation:

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4 years ago
An oil storage tank is a cylinder with a height of 50 feet and a diameter of 20 feet.What is the volume of the tank?Use 3.14 for
allochka39001 [22]

Answer:

the anser is c

Step-by-step explanation:

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6 0
3 years ago
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Which of the following is equal to (2x/3 - 7) + 7?. A. (2x - 7) + 21. B. 2x - 21/3. C. 3x/2. D. 2x/3.
Setler79 [48]

For this case we have the following expression:

(\frac{2x}{3} - 7) + 7

What we must do in this case is to use one of the properties of the sum.

In this case, we must use the associative property.

The associative property states:

(a + b) + c = a + (b + c)

We have then:

(\frac{2x}{3} - 7) + 7 = \frac{2x}{3} + (- 7 + 7)

Simplifying we have:

(\frac{2x}{3} - 7) + 7 = \frac{2x}{3} + (0)

(\frac{2x}{3} - 7) + 7 = \frac{2x}{3}

Answer:

the following is equal to (2x / 3 - 7) + 7

D. 2x / 3.

7 0
3 years ago
Read 2 more answers
Need math help please!
Otrada [13]

Answer:

ASA

Step-by-step explanation:

The triangles are already given 1 congruent corresponding angle and 1 congruent corresponding side. However, there are vertical angles at the point where the triangles intersect, meaning that they are congruent.

So now you have 2 congruent corresponding angles. But they're in the order of Angle-Side-Angle (ASA).

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4 years ago
Help me with part B and C appease!! No clowning around whoever help me, will get 30 points and I will brainliest you!!! &lt;3 pl
Dennis_Churaev [7]

Answer:

Step-by-step explanation:

a.

y=0.75x

y-y1=(y2-y1)/(x2-x1)×(x-x1)

y-3=(6-3)/(8-4) (x-4)

y-3=3/4(x-4)

y-3=3/4 x-3

y=3/4 x-3+3

y=3/4 x

if y=f(x)

f(x)=0.75x

c.

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